hvirtual/plugins/gamma/aggregated.h

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#ifndef GAMMA_AGGREGATED
#define GAMMA_AGGREGATED

// Gamma sections performed by other plugins

// Functions to get pixel from either previous effect or texture
static char *gamma_get_pixel1 =
        "vec4 gamma_get_pixel()\n"
        "{\n"
        "       return gl_FragColor;\n"
        "}\n";

static char *gamma_get_pixel2 =
        "uniform sampler2D tex;\n"
        "vec4 gamma_get_pixel()\n"
        "{\n"
        "       return texture2D(tex, gl_TexCoord[0].st);\n"
        "}\n";

static char *gamma_pow_frag = 
        "float my_pow(float x, float y, float max)\n"
        "{\n"
        "       return (x > 0.0) ? pow(x * 2.0 / max, y) : 0.0;\n"
        "}\n";

static char *gamma_rgb_frag = 
        "uniform float gamma_scale;\n"
        "uniform float gamma_gamma;\n"
        "uniform float gamma_max;\n"
        "void main()\n"
        "{\n"
        "       vec4 pixel = gamma_get_pixel();\n"
        "       pixel.r = pixel.r * gamma_scale * my_pow(pixel.r, gamma_gamma, gamma_max);\n"
        "       pixel.g = pixel.g * gamma_scale * my_pow(pixel.g, gamma_gamma, gamma_max);\n"
        "       pixel.b = pixel.b * gamma_scale * my_pow(pixel.b, gamma_gamma, gamma_max);\n"
        "       gl_FragColor = pixel;\n"
        "}\n";

static char *gamma_yuv_frag = 
        "uniform float gamma_scale;\n"
        "uniform float gamma_gamma;\n"
        "uniform float gamma_max;\n"
        "void main()\n"
        "{\n"
        "       vec4 pixel = gamma_get_pixel();\n"
                YUV_TO_RGB_FRAG("pixel")
        "       pixel.r = pixel.r * gamma_scale * my_pow(pixel.r, gamma_gamma, gamma_max);\n"
        "       pixel.g = pixel.g * gamma_scale * my_pow(pixel.g, gamma_gamma, gamma_max);\n"
        "       pixel.b = pixel.b * gamma_scale * my_pow(pixel.b, gamma_gamma, gamma_max);\n"
                RGB_TO_YUV_FRAG("pixel")
        "       gl_FragColor = pixel;\n"
        "}\n";

#define GAMMA_COMPILE(shader_stack, current_shader, aggregate_interpolation) \
{ \
        if(aggregate_interpolation) \
                shader_stack[current_shader++] = gamma_get_pixel1; \
        else \
                shader_stack[current_shader++] = gamma_get_pixel2; \
 \
        switch(get_output()->get_color_model()) \
        { \
                case BC_YUV888: \
                case BC_YUVA8888: \
                        shader_stack[current_shader++] = gamma_pow_frag; \
                        shader_stack[current_shader++] = gamma_yuv_frag; \
                        break; \
                default: \
                        shader_stack[current_shader++] = gamma_pow_frag; \
                        shader_stack[current_shader++] = gamma_rgb_frag; \
                        break; \
        } \
}

#define GAMMA_UNIFORMS(frag) \
{ \
        float max = get_output()->get_params()->get("GAMMA_MAX", (float)1); \
        float gamma = get_output()->get_params()->get("GAMMA_GAMMA", (float)1) - 1.0; \
        float scale = 1.0 / max; \
        glUniform1f(glGetUniformLocation(frag, "gamma_scale"), scale); \
        glUniform1f(glGetUniformLocation(frag, "gamma_gamma"), gamma); \
        glUniform1f(glGetUniformLocation(frag, "gamma_max"), max); \
printf("GAMMA_UNIFORMS %f %f\n", max, gamma); \
}





#endif

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